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Question

# In above shown figure, a ball of mass m strike the wall with velocity V and rebounds back with same velocity. Calculate the change in momentum.2mV directed to the leftmV directed to the leftZero2mV directed to the rightmV directed to the right

A
mV directed to the left
B
mV directed to the right
C
2mV directed to the left
D
Zero
E
2mV directed to the right
Solution
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#### Initial momentum =mV and after rebound from the wall the final momentum =−mV (negative sign is due to V is opposite to initial V )So change in momentum =−mV−(mV)=−2mV The negative sign indicates it is directed to left.

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